SELECT TOP 1 *
		FROM (SELECT
			t.Name AS [Town],
			COUNT(*) AS [Employees count]
				FROM Employees e
				JOIN Addresses a
					ON e.AddressID = a.AddressID
				JOIN Towns t
					ON a.TownID = t.TownID
				GROUP BY t.Name) TownsAndEmployeesCount
		ORDER BY TownsAndEmployeesCount.[Employees count] DESC